Dimensional Drawing is a collaborative 3D drawing space. Technically it is 2.5D, because the images are in layers. It is a Couch Application, powered by CouchDB and hosted by Iris Couch at http://www.dimensionaldrawing.com/
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Infinite tiled drawing canvas. Pan with click and drag.
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Canvases layered to form the 3rd dimension. Scroll through these using a scroll wheel on a mouse or two-finger scrolling on a trackpad. On a touch sensitive device (iPad, etc) this scrolling is done by pinching, and panning is done with two-finger gestures.
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Color picker with hue, saturation, value, opacity, and brush size.
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Eraser tool.
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Eyedropper tool.
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Location hashes allow particular locations to be bookmarked.
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Near real time updates of what other users are drawing.